UFC 188 is a UFC Heavyweight Championship unification main event card between the current UFC Heavyweight Champion Cain Velasquez (13-1-0, 11KO's) from San Jose, California and his opponent is the current Interim UFC Heavyweight Champion Fabrício Werdum (19-5-1, 6KO's) from Los Angeles, California. This is the Preliminary portion of this card that is airing live from Arena Ciudad de México in Mexico City, Mexico.